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It was thought to be the range that humans could safely live in between zero and 100 degrees. It's not exactly accurate. There are serious dangers when you get below freezing. And 100 degrees can be a little bit rough sometimes, but that's where the system came from. So despite the fact that we have two systems now, the Celsius and the Fahrenheit, that was why it was made like that. Works the Celsius was made to go from boiling to zero, freezing. Either one. If you know them, we'll tell you where to avoid the temperature extremes. So everybody, like I said, have a great day. Cause lots of trouble.